I had been using a google account long back. I am unable to access it now. Either me or google had deleted the account. How long will google take to release the username of the deleted account to use it again?
Accounts Are Never Released
According to Google, they do not release them.
For a limted time (around a month), you can restore your deleted account:
But if it was a long time ago, unfortunately you cannot. Moreover, Google does not allow the re-use (re-registration) of long time deleted accounts either: I know, I have lost an account this way and have never been able to reuse it.
Hotmail got hardly abused because was following this tactic, I guess Google learned from those mistakes and is not allowing people to re-use a deleted e-mail.